Barrel Flat Marking ?

[Brush Buster]

Thanks Brian for the reply and the Photo YEP .that's it! My little gun has no barrel weights nor frame size stamped ,which I understand to be normal for this era . Another neat item ,mine has the entire serial # stamped diagonally across the end of the rear barrel lug in very small stamping ,has anyone ever seen this before ? If I have time later ,I willtake some photos ,kind of neat how different some were stamped !